Sending email to multiple recipients using notification task

Summary

I am using the notification task to send emails to multiple recipients, delimiting them by semicolon, but it fails

Content

I need to send an email to multiple recipients using a notification activity.  I create the semicolon delimited list and/or comma delimited list and it does not show as an error in the process but the notification tab shows as failure

The SOA documentation says that [email protected];myname@example.com is valid, but yet it fails.  Anyone have any ideas?